Netcontroller 2 offline with CPU LED and Ethernet LED's on solid. This occurred after electrician installed new equipment in the same cabinet.
Controller database has become corrupt.
Clear controller RAM and Flash and reload controller.
In this instance, the Controller did not seem to respond to pressing the "reset IP" button for 30s. Removing power and battery connections for a minute and then reconnection power cleared the memory. Able to see device online and reload from the Workstation after this.